CN111537382A - Method for measuring water absorption rate of desulfurization and denitrification activated carbon and application thereof - Google Patents
Method for measuring water absorption rate of desulfurization and denitrification activated carbon and application thereof Download PDFInfo
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- CN111537382A CN111537382A CN202010378663.2A CN202010378663A CN111537382A CN 111537382 A CN111537382 A CN 111537382A CN 202010378663 A CN202010378663 A CN 202010378663A CN 111537382 A CN111537382 A CN 111537382A
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
- G01N5/025—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content for determining moisture content
Abstract
The invention relates to a method for measuring the water absorption of desulfurization and denitrification active carbon and application thereof, wherein the method comprises the following steps: a. taking the desulfurization and denitrification active carbon and enabling the desulfurization and denitrification active carbon to absorb water until the activated carbon is saturated; b. washing the desulfurization and denitrification activated carbon after water absorption; c. removing water attached to the surface of the desulfurization and denitrification activated carbon, and measuring the mass of the desulfurization and denitrification activated carbon as M1; d. removing water in pores of the desulfurization and denitrification activated carbon, and measuring the mass of the desulfurization and denitrification activated carbon again to be M2; e. calculating the water absorption X of the desulfurization and denitrification activated carbon by using the following formula: x ═ 100% of [ (M1-M2)/M2 ]. Compared with the prior art, the method for measuring the water absorption rate has higher experimental precision and accuracy.
Description
Technical Field
The invention relates to the field of desulfurization and denitrification activated carbon, in particular to a method for measuring water absorption of desulfurization and denitrification activated carbon and application thereof.
Background
The activated carbon is a carbon-based adsorption material with a developed pore structure and a huge specific surface area, and the water absorption rate of the activated carbon represents the developed degree of pores of the activated carbon. Currently, the method for measuring the water absorption of activated carbon generally comprises removing ash contained in the activated carbon material by using a vibrating screen, drying the activated carbon to remove water contained in pores of the activated carbon, and measuring the mass of the activated carbon (the mass is the weighed mass during sampling). Then the activated carbon is placed in water again to be boiled so as to fully absorb water, and the activated carbon is taken out after water absorption. Since a part of the moisture adheres to the surface of the activated carbon after the activated carbon is taken out from the water, it is necessary to remove the moisture adhering to the surface of the activated carbon to improve the measurement accuracy. In the prior art, a suction filtration method is used to remove moisture attached to the surface of the activated carbon, the mass is measured, and then the mass and the mass of the activated carbon before water absorption are used to calculate the mass fraction of the water absorption rate (i.e. the water absorption rate). In view of the above, the conventional techniques use the mass of the activated carbon before water absorption and the mass after water absorption to calculate the water absorption. Therefore, in order to ensure the weighing accuracy, a vibrating sieve process is required to be installed at the beginning of the experiment to remove the interference caused by the ash content of the activated carbon material itself. However, the prior art method does not consider that the activated carbon falls off to form new ash during boiling, so that the ash removal step is arranged before water absorption, the ash falling off during boiling cannot be removed, the activated carbon after water absorption cannot be used for ash removal by a vibrating screen machine, and the weighed mass after water absorption is inaccurate due to ash removal. In addition, the suction filtration among the prior art utilizes funnel, filter paper and buchner flask to accomplish, and it is conceivable, activated carbon can produce certain thickness when being located the funnel is inside, and consequently the activated carbon that is located the upper strata probably the suction filtration is insufficient to lead to adhering to the moisture on activated carbon surface not getting rid of completely, and the activated carbon that is located the lower floor can appear the excessive suction again and lead to activated carbon pore adsorbed partial moisture to be got rid of, can seriously influence experiment accuracy and precision. Furthermore, the methods for measuring the water absorption of activated carbon in the prior art are directed to coal-based granular activated carbon. Therefore, for activated carbon with small water absorption and large particle diameter, such as columnar desulfurization and denitrification activated carbon with diameter of 7-10mm, parameters such as sampling amount, boiling time and the like in the method for measuring the water absorption of the activated carbon in the prior art cannot be directly applied, otherwise, the water absorption measurement has large deviation.
Disclosure of Invention
The invention aims to improve the measuring method in the prior art and provide a method for measuring the water absorption of the desulfurization and denitrification activated carbon with higher experimental precision and accuracy and application thereof.
In order to achieve the above object, the present invention provides a method for determining water absorption of desulfurization and denitrification activated carbon and use thereof, wherein the method comprises the following steps:
a. taking the desulfurization and denitrification active carbon and enabling the desulfurization and denitrification active carbon to absorb water until the activated carbon is saturated;
b. washing the desulfurization and denitrification activated carbon after water absorption;
c. removing water attached to the surface of the desulfurization and denitrification activated carbon, and measuring the mass of the desulfurization and denitrification activated carbon as M1;
d. removing water in pores of the desulfurization and denitrification activated carbon, and measuring the mass of the desulfurization and denitrification activated carbon again to be M2;
e. calculating the water absorption X of the desulfurization and denitrification activated carbon by using the following formula: x ═ 100% of [ (M1-M2)/M2 ].
According to one aspect of the invention, in the step a, the desulfurization and denitrification activated carbon absorbs water to saturation by using a stirring boiling method.
According to one aspect of the invention, the churning boiling process comprises the steps of:
G1. putting the desulfurization and denitrification active carbon into a first container, and adding distilled water into the first container until the desulfurization and denitrification active carbon is immersed;
G2. heating and boiling while stirring until the desulfurization and denitrification active carbon absorbs water to saturation, and cooling to room temperature.
According to one aspect of the invention, in said step G2, the stirring boiling time lasts at least 3 min.
According to an aspect of the present invention, in the step G2, the distilled water in the first container is maintained to immerse the desulfurization and denitrification activated carbon therein during stirring boiling.
According to one aspect of the invention, the first container is a heat resistant container.
According to one aspect of the invention, in the step a, the desulfurization and denitrification activated carbon absorbs moisture to saturation by using a negative pressure vacuum pumping method.
According to one aspect of the invention, the negative pressure vacuuming method comprises the following steps:
H1. putting the desulfurization and denitrification activated carbon into a first container and vacuumizing the first container;
H2. adding distilled water into the first container until the first container is immersed with the desulfurization and denitrification active carbon;
H3. and keeping the first container vacuumized until the desulfurization and denitrification active carbon absorbs moisture to saturation, and relieving pressure to normal pressure.
According to one aspect of the invention, in step H1, the first container is evacuated to a vacuum greater than 0.05MPa or an absolute pressure less than 0.05MPa and held at a constant pressure for at least 10 min.
According to one aspect of the invention, in said step H2, the addition of distilled water is carried out for at least 2 min.
According to an aspect of the invention, in said step H3, the evacuation of said first container is maintained for at least 20 min.
According to one aspect of the invention, the first container is a sample cup.
According to one aspect of the present invention, an evacuation device for evacuating the first container includes a second container which is capable of withstanding negative pressure, is freely openable and closable, has at least two open holes, and has a viewing hole;
the first container is located in the second container.
According to an aspect of the invention, in the step b, the desulfurization and denitrification activated carbon is taken out and placed in a third container, and the desulfurization and denitrification activated carbon is washed by flowing distilled water until the washed water is clean.
According to one aspect of the invention, in the step c, the washed desulfurization and denitrification activated carbon is placed on a water absorbing medium, and the water on the surface of the activated carbon is absorbed by the water absorbing medium.
According to one aspect of the invention, the water absorbing medium is absorbent paper, an absorbent towel or an absorbent fabric.
According to an aspect of the invention, in the step d, the desulfurization and denitrification activated carbon is dried by a drying device to remove moisture in pores of the desulfurization and denitrification activated carbon.
According to one aspect of the invention, the drying temperature is at least 105 ± 5 ℃ and the drying time is at least 2 hours.
According to one aspect of the invention, the method for measuring the water absorption of the desulfurization and denitrification activated carbon is used for detecting or identifying the regeneration effect or inactivation condition of the desulfurization and denitrification activated carbon.
According to one aspect of the invention, the method for measuring the water absorption of the desulfurization and denitrification activated carbon is used for debugging the operation parameters of the desulfurization tower on site.
According to the concept of the present invention, it is contemplated that the boiling process will cause the activated carbon to shed some residue or particulate matter (i.e., fly ash). Therefore, the invention carries out the ash removal step after the activated carbon absorbs water and is saturated. And the subsequent process step of falling off substances on the activated carbon can be avoided, so that the quality change of the activated carbon can be avoided, the dust adsorbed on the surface of the activated carbon sample (namely primary ash) can be removed by once ash removal, and the floating ash (namely secondary ash) falling off from the surface of the activated carbon by using a stirring boiling method in the water absorption step can be removed, so that the error of the experimental process is reduced, and the accuracy and precision of the experiment are improved. The ash removal step of the invention is to wash the activated carbon by using flowing water, and compared with a vibrating screen of a vibrating screen machine, the method has smaller impact on the activated carbon, and can reduce the damage of the experiment for measuring the water absorption rate to the activated carbon.
According to one aspect of the present invention, in the activated carbon water absorption step, water is not only absorbed into the activated carbon but also remains on the surface of the activated carbon. Therefore, in order to eliminate the adverse effect of the moisture remained on the surface of the activated carbon on the subsequent calculation of water absorption, the invention also provides a step of removing the moisture on the surface of the activated carbon. In order to overcome various defects that surface adsorbed water is retained due to insufficient suction filtration of an upper layer of water-absorbing activated carbon and adsorbed water is not actually measured due to excessive suction filtration of a lower layer of activated carbon, which are caused by the fact that suction filtration is utilized in the prior art, and partial pore water is lost due to excessive suction filtration, so that a final water absorption calculated value is deviated or even wrong, and the like.
According to an embodiment of the present invention, during the process of absorbing water by the activated carbon, the activated carbon can sufficiently absorb water by a stirring boiling method. During boiling, water is injected into the beaker at intervals, so that the water is prevented from being dried. And stirring is carried out simultaneously during boiling, so that the activated carbon sample can absorb water more fully and the water absorption time is shorter by using a boiling mode as compared with the prior art.
According to one scheme of the invention, in the process of absorbing water by the activated carbon, the activated carbon can fully absorb water by utilizing a negative pressure vacuumizing mode. The negative pressure vacuum pumping method does not use open fire, so that the safety risk caused by using the open fire in the experiment can be eliminated.
Drawings
FIG. 1 is a flow chart schematically showing a method for measuring water absorption of desulfurization and denitrification activated carbon according to an embodiment of the present invention;
FIG. 2 is a schematic view of a vacuum extractor for carrying out the method for measuring water absorption of desulfurization and denitrification activated carbon according to the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
The present invention is described in detail below with reference to the drawings and the specific embodiments, which are not repeated herein, but the embodiments of the present invention are not limited to the following embodiments.
When the activated carbon for desulfurization and denitrification is prepared, the preparation method is a method well known to those skilled in the art and is not a protection focus of the present invention, so the following only gives the raw material ratio and the process parameters of the activated carbon for desulfurization and denitrification to which the method of the present invention is applicable. Wherein the raw materials are as follows: weakly caking coal: coal fertilizing: 20-30 percent of semi coke and 40-60 percent of semi coke. The carbonization temperature of the preparation process is 600-700 ℃, the carbonization time is 1h, the activation temperature is 900-950 ℃, and the activation time is 10 min. Wherein the binder utilized is coal tar.
Referring to a flow chart of the method for measuring the water absorption of the desulfurization and denitrification activated carbon of the present invention shown in fig. 1, first, a part of the desulfurization and denitrification activated carbon is sampled, and the sampling may be performed by mass or by volume. Sampling by mass was between 15 and 45g, and sampling by volume was between 25 and 75 mL. In this embodiment, the sample amount is 30g, and then the activated carbon is required to absorb water, and in order to sufficiently absorb water until the activated carbon is saturated, two methods, the first method is stirring and boiling, can be employed.
When the stirring and boiling method is adopted, the obtained sample is put into a first container. In this embodiment, the first container is preferably a heat-resistant container, and the first container is preferably a beaker. The beaker volume is between 250 and 500 mL. Then, 100 to 400mL of distilled water was poured into the beaker until the activated carbon was immersed and the liquid level height was recorded, in this embodiment, the amount of water was 100 mL. It is necessary to heat both distilled water and the activated carbon sample until boiling. During the heating, stirring was continued. Specifically, the beaker can be placed on an electric heating furnace and fixed by a bracket, then the stirring paddle of the stirrer is placed in water to start stirring, the rotating speed of the stirring paddle is 100-. During stirring and boiling, in order to avoid water from being boiled to dryness, distilled water is continuously supplemented, namely water is injected into the beaker every 3min, so that the liquid level in the beaker is always immersed in the activated carbon sample. When boiling for at least 3min (in the present embodiment, the boiling time is 5min), stopping heating and stirring, and cooling the activated carbon to room temperature, wherein the cooling time is controlled to be between 15-20min, and the activated carbon is considered to be saturated with water. The cooling time can be determined according to actual requirements, but the cooling time of each sample must be kept consistent.
The other mode of fully absorbing water by the activated carbon is a negative-pressure vacuumizing mode, and open fire cannot be utilized, so that the safety coefficient is higher, and potential safety hazards such as explosion, fire and the like are eliminated. When the vacuum-pumping system is used, the vacuum-pumping apparatus used in the present invention shown in fig. 2 includes a second container 5 which is capable of withstanding negative pressure, is freely openable and closable, has a transparent observation hole, and has at least two openings. By freely openable and closable is meant that there is an openable and closable door or lid to enable access to the first container 8 and to enable a seal to be formed after closure. In accordance with the above function, the present embodiment selects a filter flask as the second container 5. The first step of the evacuation method is to place the taken-out sample in the first container 8, and in this embodiment, the first container 8 is a sample cup. Then, the sample containing cup is placed in the filter flask through an opening at the upper end of a cover body of a second container 5, the cover body is covered, a water valve 7 and a pressure release valve 6 are closed, a vacuum pump 2 is opened, a regulating valve 4 is regulated to be vacuumized until a pressure gauge 1 measures that the vacuum degree in the filter flask is more than 0.05MPa (or the absolute pressure is less than 0.05MPa) (the vacuum degree in the embodiment is 0.09MPa (the absolute pressure is 0.01MPa)), and the constant pressure is kept for at least 10min, wherein the constant pressure is 20min in the embodiment. The purpose of this negative pressure process is to vent the air from the pores of the activated carbon for subsequent adequate water absorption by the activated carbon. In order to prevent suck-back, the invention provides a safety bottle 3 between the regulating valve 4 and the vacuum pump 2. And then the water valve 7 is opened, and the distilled water in the water measuring device 9 is slowly injected into the sample containing cup due to the action of negative pressure until the sample is completely immersed, and then the water injection is stopped. Since too fast a water injection would result in insufficient water absorption by the small pores in the activated carbon, the slower this water injection process is the better. On the premise of ensuring the efficiency, the water injection process is also ensured to be at least 2min at the fastest speed, the water injection time of the embodiment is 2min, and the water injection quantity is 100 mL. After the water injection is completed, the water valve 7 is closed, and then the vacuum is maintained for at least 20min, in this embodiment for 30 min. Because the activated carbon is in a vacuum environment, atmospheric pressure can press water into pores of the activated carbon, so that the activated carbon sample absorbs water to saturation. And finally, closing the vacuum pump 2, opening the pressure release valve 6 to release the pressure to the normal pressure, then taking out the sample containing cup, and taking out the activated carbon after water absorption. Therefore, the cover body of the filter flask of the embodiment is provided with three openings which are respectively connected with the vacuum-pumping pipeline, the water inlet pipeline and the pressure relief pipeline. And in fact, if the upper space of the cover body of the filter flask is limited, the pressure release valve is arranged on the vacuumizing pipeline or the water inlet pipeline, the opening for installing the pressure release pipeline does not need to be additionally arranged, and only two openings are arranged.
Because part of ash on the surface of the activated carbon falls off in the boiling process, the activated carbon needs to be washed with water to remove ash after being cooled to room temperature. In this embodiment, 400mL of distilled water was injected into the third vessel and then stirred with a stir bar for about 8-20 cycles. And pouring water after stirring is finished, so that one-time washing is finished. The third vessel is a beaker, and when the stirring boiling method is used, the beaker for boiling may be used as it is or a new beaker may be replaced. And repeating the steps until no residue is left in the water after visual inspection, and washing for at least three times. According to the invention, the cleaning water after being washed for three times in the manner is basically free of other residues, so that the activated carbon can basically reach the subsequent experimental standard by being washed for three times without additional washing from the viewpoint of saving experimental time and cost. The prior art deashing process usually uses a vibrating screen machine to remove ash before sampling, and does not consider that floating ash is generated after boiling. In the washing step of the invention, dust (primary ash) adsorbed on the surface of the activated carbon sample and floating ash (secondary ash) generated during boiling can be removed at one time, so that the quality of subsequent measurement is not interfered by the dust, the accuracy and precision of the experiment are improved, and the screening and ash removing process of a vibrating screen machine before sampling is omitted. However, although the vacuum pumping mode does not cause serious ash falling phenomenon like boiling, the invention still uses the water washing method after vacuum pumping, thereby saving the screening step of a vibrating screen machine and achieving the purposes of saving cost and improving efficiency. The washing with water may be performed without using the stirring system using the stirring rod in the present embodiment, and the distilled water may be directly washed with running water until the washed water is clean (similarly, it is possible to visually check) because the distilled water is stirred by the stirring rod for the purpose of flowing the water.
After washing with distilled water to remove ash, water attached to the surface of the activated carbon should be removed to ensure the accuracy of the measured water absorption. In the prior art, water absorption paper is generally placed in a funnel in an experiment for measuring the water absorption of activated carbon, then the activated carbon is poured into the funnel, and finally the mouth part of the funnel is placed in a suction bottle for suction filtration. Obviously, activated carbon forms a certain thickness in the funnel, and the suction filtration of the suction filtration bottle from the bottom cannot involve the activated carbon positioned on the upper layer, so that the suction filtration pressure of the upper layer is insufficient, and the moisture on the surface of the activated carbon on the upper layer is not sufficiently removed; and the suction filtration pressure of the activated carbon at the bottom is too high, so that excessive suction occurs, namely, moisture in pores of the activated carbon is also sucked, and finally calculated water absorption is inaccurate. In the invention, the activated carbon is directly placed on the water-absorbing medium, and the water-absorbing medium can be water-absorbing paper, water-absorbing towel or water-absorbing fabric, and the embodiment utilizes the water-absorbing paper. After the activated carbon is placed on the absorbent paper, the activated carbon sample is paved, and then the water on the surface of the activated carbon is directly absorbed by the absorbent paper, so that the condition that the water in the activated carbon is removed or the surface water is not removed sufficiently does not exist, and the determination of the water absorption rate is more accurate. After the water on the surface of the activated carbon was removed by blotting with a water absorbent paper, the mass of the activated carbon was measured and recorded as M1.
All moisture in the pores of the activated carbon should be removed later, and the embodiment utilizes drying equipment to dry the activated carbon to achieve the purpose. The drying equipment is an oven, the drying temperature is at least 105 +/-5 ℃ (in the embodiment, the drying temperature is 150 +/-5 ℃), and the drying time is at least 2h (in the embodiment, 2 h). Of course, any method or apparatus for removing water using the principle of thermal evaporation can be applied to the present invention, only for the purpose of removing water from the pores of the activated carbon. The mass of activated carbon was again measured after drying as described above and is designated as M2. The above weighed masses should be accurate to 0.01 g. Repeating the above steps to obtain another sample.
Thus, through the above operation, two data of M1 and M2 are obtained. The water uptake X of the activated carbon can then be calculated using these two data. The calculation formula is as follows:
X＝[(M1－M2)/M2]*100％。
in conclusion, in the method for measuring the water absorption rate (water absorption rate), the washing step is moved backwards to the position where the activated carbon absorbs water, so that ash content in the activated carbon and floating ash falling off during water absorption can be removed at one time, the experimental precision is improved, and the vibrating and screening step is omitted, so that the experimental efficiency is improved. The setting of each parameter in the invention also enables the method of the invention to be applied to the determination of the water absorption of the columnar phi 7-10mm of the desulfurization and denitrification active carbon.
Hereinafter, the improvement of the present invention with respect to the prior art will be described in detail.
Firstly, the sampling amount and the boiling time in the traditional determination method cannot be applied to the columnar phi 7-10mm desulfurization and denitrification active carbon. The present invention therefore initially makes improvements to these parameters without initially altering the conventional measurement procedure. The traditional boiling method has the following process parameters: the method comprises the steps of sampling 25mL, adding 100mL of water, boiling for 15min, removing the water on the surface of the activated carbon by using a suction filtration method, carrying out suction filtration for 5min, and carrying out suction filtration under the pressure of 8 KPa. On the other hand, since the above parameters are only for coal granular activated carbon, when the sample volume is 25mL, the sample volume for the desulfurization and denitrification activated carbon having a columnar shape of phi 7 to 10mm is too small, and thus the calculated water absorption rate varies too much. For this, the improved boiling method measures parameters: the sampling amount is 30g, the water adding amount is 100mL, the boiling time is 5min, the suction filtration time is 5min, and the suction filtration pressure is 8 KPa. Subsequently, in order to make the desulfurization and denitrification activated carbon absorb water more quickly, the invention simultaneously stirs in the boiling step so as to make the activated carbon absorb water to saturation more quickly. Meanwhile, the invention also designs a method parallel to the boiling stirring method, namely a negative pressure vacuum pumping method, which can also ensure that the activated carbon absorbs water to saturation and can also eliminate the safety risk caused by using open fire in the experiment. And the suction filtration method is changed into a method of directly absorbing the water on the surface of the activated carbon by using a water absorbing medium. Above all, moving the ash removal step backwards after water absorption is an improvement of the prior art in the present invention. The following table 1 is values of water absorption of activated carbon measured in parallel after being divided into five groups using four methods, respectively, to compare:
TABLE 1 comparison of water absorption of activated carbon measured by four methods
Description of the drawings:
1. fluctuation deviation is the difference between the maximum and minimum of the parallel measurement of the sample
2. Degree of deviation (fluctuation deviation/average value) × 100%
In this connection, the conventional boiling method, i.e., the measurement method in the prior art, is described in table 1. The improved boiling method is a method for changing the parameters of the traditional boiling method. The agitation boiling method and the negative pressure suction filtration method are methods for measuring the water absorption rate according to the above-described embodiment of the present invention, respectively. The values in table 1 are water absorption rates, and because of errors in the experimental process, the water absorption rate value of a single experiment cannot be used as the evaluation standard of the method, and the evaluation needs to be performed by adopting an average value. Therefore, the average value of the five groups of water absorption values of the improved boiling method, the stirring boiling method and the negative pressure suction filtration method is larger than that of the traditional boiling method, and the average value of the water absorption measured by the stirring boiling method and the negative pressure suction filtration method is larger than that of the improved boiling method. In addition, the five groups of measurement result values are observed, and it is easy to find that the water absorption rate is measured by adopting the traditional boiling method and the improved boiling method, the fluctuation deviation of the sample measurement is large, the deviation degree is high (8.2% and 4.6%), which indicates that the measurement result of the measurement method in the prior art has poor parallelism, large measurement deviation is easy to generate, the data error is large, and the measurement value is low due to the influence of factors such as ash falling off in the water absorption process of the boiling link in the measurement step. The stirring boiling method and the negative pressure suction filtration method effectively eliminate factor interference such as ash falling off in the water absorption stage in operation, so that the water absorption measured by the measuring method of the invention has higher accuracy and precision compared with the prior art.
The method for measuring the water absorption rate is mainly applied to the field, on one hand, the water absorption rate of the activated carbon in the desulfurizing tower can be measured to conjecture the performance of the activated carbon, and technicians are guided to optimize the operating conditions of the desulfurizing tower, so that the efficiency of removing sulfur dioxide and nitrogen oxide by the desulfurizing tower is highest; on the other hand, the water absorption of the regenerated activated carbon can be measured, the performance of the regenerated activated carbon after regeneration can be known, and technicians can be guided to optimize the operation conditions of the regeneration tower, so that the regeneration effect can be optimal. The following table 2 shows a set of desulfurization and denitrification activated carbon samples (the activated carbon sample is from a steel plant, the sample is a desulfurization and denitrification activated carbon prepared by using an anthracite formula and tar as a binder and using a conventional activated carbon preparation method) before and after desulfurization and regeneration, and the water absorption values of the activated carbon samples are measured by using a stirring and boiling method:
TABLE 2 Water absorption Change before and after use of activated carbon
| Sample (I) | Fresh activated carbon | Active carbon in desulfurizing tower | Regenerated active carbon of desorption tower |
| Water absorption (%) | 45.27 | 33.10 | 43.69 |
As shown in table 2, by measuring the water absorption of the activated carbon, the field technician can clearly determine the state (inactivation degree, regeneration degree) of the activated carbon, thereby estimating the operation condition of each tower, and optimally adjusting the operation parameters thereof, without sampling from a field desulfurization tower or an analytical tower, measuring the desulfurization value and the denitrification rate of the activated carbon by a complicated and time-consuming method, and then adjusting the production operation condition, thereby eliminating the rough operation risk caused by the conventional production mode depending on the judgment of field worker experience.
The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and it is apparent to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (20)
1. A method for measuring the water absorption of desulfurization and denitrification activated carbon comprises the following steps:
a. taking the desulfurization and denitrification active carbon and enabling the desulfurization and denitrification active carbon to absorb water until the activated carbon is saturated;
b. washing the desulfurization and denitrification activated carbon after water absorption;
c. removing water attached to the surface of the desulfurization and denitrification activated carbon, and measuring the mass of the desulfurization and denitrification activated carbon as M1;
d. removing water in pores of the desulfurization and denitrification activated carbon, and measuring the mass of the desulfurization and denitrification activated carbon again to be M2;
e. calculating the water absorption X of the desulfurization and denitrification activated carbon by using the following formula: x ═ 100% of [ (M1-M2)/M2 ].
2. The method for measuring water absorption of desulfurization and denitrification activated carbon according to claim 1, wherein in the step a, the desulfurization and denitrification activated carbon absorbs water to saturation by using a stirring boiling method.
3. The method for measuring the water absorption of the desulfurization and denitrification activated carbon according to claim 2, wherein the stirring boiling method comprises the following steps:
G1. putting the desulfurization and denitrification active carbon into a first container, and adding distilled water into the first container until the desulfurization and denitrification active carbon is immersed;
G2. heating and boiling while stirring until the desulfurization and denitrification active carbon absorbs water to saturation, and cooling to room temperature.
4. The method for measuring the water absorption of the desulfurization and denitrification activated carbon according to claim 3, wherein in the step G2, the stirring boiling time lasts at least 3 min.
5. The method for determining the water absorption of SOx/NOx control activated carbon according to claim 4, wherein in the step G2, the distilled water in the first container is kept to immerse the SOx/NOx control activated carbon therein during stirring and boiling.
6. The method for measuring the water absorption of desulfurization and denitrification activated carbon according to any one of claims 3 to 5, wherein the first container is a heat-resistant container.
7. The method for measuring water absorption of desulfurization and denitrification activated carbon according to claim 1, wherein in the step a, the desulfurization and denitrification activated carbon is caused to absorb moisture to saturation by a negative pressure vacuum pumping method.
8. The method for measuring the water absorption of the desulfurization and denitrification activated carbon according to claim 7, wherein the negative pressure vacuum pumping method comprises the following steps:
H1. putting the desulfurization and denitrification activated carbon into a first container and vacuumizing the first container;
H2. adding distilled water into the first container until the first container is immersed with the desulfurization and denitrification active carbon;
H3. and keeping the first container vacuumized until the desulfurization and denitrification active carbon absorbs moisture to saturation, and relieving pressure to normal pressure.
9. The method for measuring the water absorption of desulfurization and denitrification activated carbon according to claim 8, wherein in the step H1, the first container is vacuumized until the vacuum degree is more than 0.05MPa or the absolute pressure is less than 0.05MPa, and the constant pressure is maintained for at least 10 min.
10. The method for measuring the water absorption of the desulfurization and denitrification activated carbon according to claim 8, wherein the distilled water is added in the step H2 for at least 2 min.
11. The method for measuring the water absorption of desulfurization and denitrification activated carbon according to claim 8, wherein the first container is kept evacuated for at least 20min in the step H3.
12. The method for measuring the water absorption of desulfurization and denitrification activated carbon according to claim 8, wherein the first container is a sample cup.
13. The method for measuring water absorption of desulfurization and denitrification activated carbon according to any one of claims 8 to 12, wherein the evacuation device for evacuating the first container comprises a second container which is capable of withstanding negative pressure, is freely openable and closable, has at least two open pores, and has an observation hole;
the first container is located in the second container.
14. The method according to claim 1, wherein in the step b, the activated carbon is taken out and placed in a third container, and the activated carbon is washed with flowing distilled water until the water is clean.
15. The method for measuring the water absorption of the desulfurization and denitrification activated carbon according to claim 1, wherein in the step c, the desulfurization and denitrification activated carbon after being washed with water is placed on a water absorbing medium, and the water on the surface of the desulfurization and denitrification activated carbon is absorbed by the water absorbing medium.
16. The method for measuring the water absorption of the desulfurization and denitrification activated carbon according to claim 15, wherein the water absorbing medium is water absorbing paper, a water absorbing towel or a water absorbing fabric.
17. The method for measuring the water absorption of the desulfurization and denitrification activated carbon according to claim 1, wherein in the step d, the desulfurization and denitrification activated carbon is dried by using a drying device to remove moisture in pores of the desulfurization and denitrification activated carbon.
18. The method for measuring the water absorption of the desulfurization and denitrification activated carbon according to claim 1 or 17, wherein the drying temperature is at least 105 ± 5 ℃ and the drying time is at least 2 hours.
19. The method for measuring the water absorption of the desulfurization and denitrification activated carbon according to any one of claims 1-18, which is used for detecting or identifying the regeneration effect or inactivation condition of the desulfurization and denitrification activated carbon.
20. The method for measuring the water absorption of the desulfurization and denitrification activated carbon according to any one of claims 1-18, which is used for debugging the operating parameters of a desulfurization tower on site.
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